Dough-mixing machine.



c. GHAMBERE, .13., 123cm.

n M. P., B. B. &. J. H. CHAMBERS, BXEOUTOES.

DOUGH MIXING MACHINE.

APPLIOATION FILED JULY 13, 1909.

' ATTORNEY.

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CYRUS GHAMBERS, 33., OF OVERBROOK, PENNSYLVANIA; MARY P. CHAMBERS, S.BERNARD CHAMBERS, AND J. HOWARD CHAMBERS EXECUTORS OF SAID CYRUSCHAMBERS, J3... DECEASED. I

. DOUGH-MIXING MACHINE.

aoosgree.

Specification of Letters Patent.

Application filed July 13, 1909. Serial No. 507,310.

i To all whom it may concern;

which the/following is a specification.

My invention relates to improvements in dough mixing machines.

The object of my invention is to provide a small machine for domesticuse, which can be economically constructed and operated for working theprocess substantially as described in my Patent No. 852,497 dated May7,1907.

In several respects this machine is slmllar to the machine described inmy Patent No.

921,361 dated May 11, 1909: Themachine in said patent however being apower operated machine adapted to mix large quantities of dough at atime, while the present machine is adapted for family use, being ahand-operated machine for mixing small batches of dough.

My invention also comprises various improvements in detailsofconstruction.

Referring to the drawings :Figure 1 15 an end elevation of my device.Fig. 2 is a vertical section on line 22 of Fig.3. Fig. 3 is a plan view.Fig. 4 is a longitudinal section on line 4-4 of Fig. 2. Fig. 5 is a viewof the under side of the sifter rod and 1 associated mechanism.

Similar numerals refer to similar parts throughout the several views.

The mixing basin 7 and the spiral mixing rods 8, 9, 10 and 11 aresimilar to those shown in said Patent No. 921,361, and operatedsubstantially in a similar manner. The spiders 13 carrying these spiralrods are cast directly onto the shaft integral with the gear wheels,winch and interlocking device, thereby eliminating the expense of adetachable coupling connection as described in said patent.

The air chamber 14 is made with its sides parallel and extendingvertically from the outer margin of the mixing chamber so as to have across-section horizontal area equal to the horizontal area of the top ofthe mixing basin. This gives a free clear way for the discharge of flourfrom the sifter over the entire area of the mixing basin. Within the airchamber is suspended and secured thereto the perforated sifter 15 havinga semi-circular formation from a center slightly above the top of theair chamber.

This sifter extends up around and over the upper edge ofthe air chamberas shown in Figs. 1 and 2, especially. The body is bent inwardly oneither side as at 16, and then extends horizontally as at 17, curvingaround the rim of the air chamber as at 18, preferably forming apermanent connection therewith. This forms a swell at either side of thesifter which serves to throw in toward the center line of the sifter,any flour that Y may be pushedupward by the sifter rod toward the upperedge of the sifter, and not over the rounded edge; It will be noted thatthe diameter of the widest part of the sifter hopper within the airchamber is considerably less than the diameter of the air chamber, andthat the perforations of the sifter hopper are continued throughoutswells 19 and bent-in portions 16. It will thus be clear that the flourmay be sifted through parts 19 and 16 and will fall freely into themixing chamber. The adjacent edges of the air chamber and'mixing basinare provided wit-h the reinforcing rims 20 and 21 which form largecooperating surfaces for making an eflicient joint between said twomembers. Said reinforcingrims also serve to. stiffen the body of the airchamber and the mixing basin and also contribute to sightliness of thecompleted structure. Any suitable catches, such as 22, serve to lock thetwo members together.

The rock shaft 23 is journaled in boxes 24 which ournal box structuresare riveted as at 25, see Fig. 1, to the end walls of the air chamber.The rock shaft thus has a middle longitudinal extension over the siftinghopper 15. These journal boxes 24' extend above the top of the airchamber and consequetly above and beyond the line to which the flourcomes when the sifting hopper is full, thereby avoiding any leakage offlour through said journal boxes. The cubical capacity of the sifterhopper has preferably a capacity relative to the capacity of the mixingbasin.

To the rock shaft 23 are rigidly secured the two arms 26 whose hubs 27lie against the journal boxes 24 thus forming abutments for the endthrust thereof. The arms 26 have an inclined convergent extension towardthe middle of the machine at an angle approximately forty-five degreesfor Patented Oct. 1c, 1911.

about half way their extension and then perpendicularly the balance ofthe way as clearly shown in Fig. 4.v Arms 26 are provided at their lowerends with the vertically extending slots 29 -which form bearings for thesifter roller 28 about one-quarter the distance from each end. Thisserves to balance the strain between the middle of said bearings andtheir ends to relieve any tendency to strain the sifter roller which isof very s..1all diameter. The sifter roller has a gravity engagementwith the bottom of the sifter hopper and has room to move up and down inthe slots 29. The lower ends of arm 26 arealso provided with the plows30, which as they move through the flour in either direction are adaptedto push the flour to either side and allow free passage for the sifterroller boxes. These double plows30 have their undersides in the segmentsof circles, the arc of which corresponds with the distance their loweredge is from the center of this rock shaft 23. Should the sifting rollermeet with any 0bstructions, such as a hard lump, a nail or other hardsubstance, in the flour, it will hop over the same without injuring thesifter hopper, but it will always return by gravity to its normalposition and the proper position for doing efiicient work and yet befree to move without binding. It will thus, be clear that arms 26 may berigidly connected with rock shaft 23 instead of working in slots thereinas shown in my said prior patent, and that although the sifter roller isof very small diameter, it will nevertheless be free from strain at alltimes, due tothe bends in arms 26 and to the elongated slots 29. Thereciprocating motion is given to the sifting rod through the rock shaft23 in the usual way by the crank 31 secured torock shaft 23 connectingrod 32 and crank 33 on one of the gear wheels 34 connecting theshafts ofthe spiral mixing rods, the other gear wheel 35 may be provided with theusual winch 36 for manual operation. The handle 37 is also secured bytwo lugs or arms 38 riveted to the side of the air chamber. This isprovided for steadying the machine with one hand while the winch isbeing turned.

The chief improvements or differences in the present device over thatshown in the patents referred to, may be enumerated as follows: theformation of the mixing hop-' per, giving a greater relative surface orperforated area, and providing means for preventing the flour beingthrown over the edge of the hopper, namely, the perforated swells 19spaced away from the walls of the air chamber and the perforated bent-inportions 16; the formation and disposition of for permanently securingthe sifter hopper to the air chamber; the means for securing the journalboxes of the rock shaft to the walls of the air chamber; the castin ofthe mixing rod spiders integral with t e supportingshafts and gearwheels; the securing of the rock shaft to the air chamber instead of tothe sifterhopper and other details of construction, whichcontribute inproducing an extremely inexpensive and etficient machine for family use.

The operation of my device is as follows:-The proper quantity of yeast,milk and other suitable liquid ingredients are 'placed in the mixingchamber 7. The airchamber is then put in place as shown in Fig. 1, andflour is introduced into the sifter hopper 15. The winch 36 is thenoperated to turn the mixing rods in the mixing chamber and the rockshaft 23 is simultaneously operated through the connecting rod 32. Thisgives a sweep to the arms 26 and consequently the sifting rod 28, overnearly the entire curved surface of the sifter hopper. v

The first sweep of the rod will deliver the greatest quantity of flourto the mixing chamber, but as the operation proceeds and the level ofthe floor descends in the sifter hopper, the amount of flour with eachoscillation of the rock shaft 23 gradually decreases, and this decreasecorresponds to the gradual thickening of the mixture in the mixingchamber.

What I claim is In a dough mixing machine, the combination of a mixingchamber and mixing mechanism therein, an air chamber superimposing themixing chamber, a sifter hopper connected with the top of the airchamber having a substantially semi-circular formation, a rock shaftjournaled above the top of the sifter hopper, journal boxes thereforsecured to the walls of the air chamber, arms secured to the rockshaft'extending part way inclined and convergent to each other and partway perpendicular to the rock shaft, having slotted ends with doubleended plows having their undersides in the arc of a circle correspondingsubstantially to the curved contour ofthe sifter hopper, and a sifterrod engaging in said slotted ends.

CYRUS CHAMBERS, J B.

